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- Geology, Stratigraphic244
- Paleontology224
- Geology189
- Tertiary Geologic Period160
- Paleobotany68
- Mollusks, Fossil49
- Cretaceous Geologic Period39
- Foraminifera, Fossil19
- Vertebrates, Fossil12
- Mammals, Fossil10
- Groundwater9
- Bivalves, Fossil8
- Formations (Geology)8
- Geology, Structural8
- Volcanic ash, tuff, etc8
- Insects, Fossil7
- Coal6
- Hydrogeology6
- Igneous rocks6
- Borings5